Datasheet

If you are using the shield with a 3.3V logic Arduino, you may want to change the Vio

jumper. This is what the 10K pullups for I2C are pulled up to. Honestly, the pullups are very

weak so if you forget, it's not a big deal. But if you can, cut the small trace between the

center pad and 5V and solder the other side so that Vio is connected to 3V